Comment 2 for bug 862136

Install libvirt-bin and qemu-kvm on standard workstation install.

Remove the default network with 'virsh net-destroy default'

Define the new network with 'virsh net-define fred.xml'

Try to start the network with 'virsh net-start br000002'

This results in an error:

"error: Failed to start network br000002
error: internal error Child process (dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/br000002.pid --conf-file= --except-interface lo --listen-address 10.0.0.1 --listen-address 2a02:1348:134::1) status unexpected: exit status 2"

virsh net-edit br000002 and remove the IPv6 XML 'ip' entry

virsh net-start br000002 will then work with just the IPv4 settings.